Can the 74LS138 be run backwards? In Ken's diagram he has inputs connected to the chips outputs. Does that work? The data sheet for the 74LS138 has a gate diagram that suggests it wont. Anyone tried it this way?

EDIT

....Never mind...I see how it works now. It's outputting a voltage to the key, then the paralel port scans through all the keys and detects when the key that is on.Last edited by widdly on Thu Aug 05, 2010 10:12 pm; edited 1 time in total

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